Elon Musk - the mind behind Tesla, SpaceX, SolarCity...
Well, it goes back to when I was in university. I thought about, what are the problems that are most likely to affect the future of the world or the future of humanity? I think it's extremely important that we have sustainable transport and sustainable energy production. That sort of overall sustainable energy problem is the biggest problem that we have to solve this century, independent of environmental concerns. In fact, even if producing CO2 was good for the environment, given that we're going to run out of hydrocarbons, we need to find some sustainable means of operating.